Hole straightening or reaming bit



June 28, 1938. w. HUGHES HOLE STRAIGHTENING OR REAMING BIT Filed Sept. 19. 1936 /V VENTO R. Mu, ran Hua/ifs BX MA T'ORNE Patented June 28, 1938 UNITED STATESv PATENT OFFICE 2,122,063 HOLE STRAIGHTENINGoR REAMING Brr Walter Hughes, Long Beach, Calif.

Application September 19, 1936, Serial No. 101,591 s claims. (01255-71) This invention relates to a hole straightening or `reaming bit consisting of an off-center cutter, `the tool depending upon the stiffness and weight of the drill string'to keep the cutter in contact 5: with the side wall of the hole.v

An object of my invention is to provide a bit which will cut or shave the side walls of a hole to enlarge the diameter of the hole and also to remove any irregularities on the wall of the hole,

i thereby cutting the wall and leaving a smooth surface.

Another object of my invention is to provide a tool of the character stated, which is so arranged that the cutter will engage and cut on the low side of the hole if the hole is not perfectly vertical, thus straightening the hole.

Still another object is to provide a novel means of conveying the circulating Water or mud to the side of the cutter where said water or mud will cut or shave the side walls of the hole.

A feature of my invention resides in a novel wash pipe which conveys circulating fluid to the side of the cutter and which wash pipe can be renewed when Worn.

Other objects, advantages and features of invention may appear from the accompanying drawing, the subjoined, detailed description, and the appended claims.

In the drawing:

Figure 1 is a fragmentary side elevation of my ,bit. f

f Figure 2 is a fragmentary elevation taken at right angles to Figure 1.

Figure 3 is a bottom plan view of the bit.

Figure 4 is a fragmentary side elevation of the bit in position in a hole.

Figure 5 is a fragmentary elevation of the bit in position in a hole, this view being taken at right angles to Fig. 4.

Referring more particularly to the drawing, the numeral I indicates the body of the bit, the upper end of which is threaded, as shown at 2, to receive a drill string-3. The body l is provided with a water course 4 which extends axially thru 45 the body, the purpose of which bore will be fur- .ther described.

A single arm 5 is integrally formed with the body l. This arm is offset from the longitudinal center line of the body, as shown in Fig. 2, and

50 also leads the center of the body as shown in Figs.

1 and 3.

The cutting bit 6 is rotatably mounted adjacent the lower end of the arm 5. While the cutter 6 is here disclosed as a disc, it is obvious that other 55 types or lshapes of cutters may be used, if desired. The cutter 6 is journaled on a pin 'l which is locked in the arm 5. In trimming a bored hole or straightening same, it is very desirable to force a stream of water under high pressure against the wall which is being cut, this stream of water also impinging upon4 the periphery of the cutter, thereby keeping the cutter free of accumulations of detritus.

t For the purpose of washing the cutter and jetting the wall of the hole, I provide a nozzle 8 which is formed of a bent piece of pipe, the outer end of which is encircled by a clamp 9 which clamp is attached to or is an integral part of` the pin 1. A fitting I0 couples the pipe 8 to a sleeve Il which sleeve screws into the lower end of the body I and communicates with the circulating bore 4. The pipe 8 is bent at an angle so that the force of the circulating fluid is directed towards the wall of the bore, and also flows over the outer edge of the bit 6.

It will also be evident from Figs. 1 and 2, that the circulating fluid is directed downwardly as well as outwardly, thereby effectively washing and jetting the wall of the hole and materially assisting in breaking down the wall and permitting the bit to cut rapidly.

The drill string 3 is of suii'icient stiffness that the body l will always be held in a vertical plane, and due to the stiffness of this drill string, the cutter 6 will serve to straighten a hole if the bore is previously deflected, by cutting on the low side of the bore substantially as shown in Figs. 4 and 5.

When a bit of the character here disclosed is mounted on the lower end of a drill string which is stiff, and said drill string having great weight, there is a constant tendency for this drill string to hang plumb in the hole. As the bit, with its olf-.center cutter, passes downwardly in the hole, the drill string is shoved toone side of the hole. If the hole below the casing is too small to allow the drill string to center itself or to hang plumb, then, owing to the stiffness and weight of the drill string, the cutter will be held or pushed against the side wall of the hole. When the bit is revolved, the cutter will shave off the side wall of the hole until the drill string can hang plumb. If the hole is deflected, i. e., is not vertical, the bit-after passing the casingwill cause the cutter to be pushed against the low side of the hole. Now when the bit is revolved, the cutter will shave off the portion of the side Wall which keeps the drill string from hanging plumb and this cutting Will continue until the hole is enlarged enough to allow the drill string to hang vertical, i. e., the hole will then be straightened.

the arm, said bit being mounted on a stiff dri-l l v string whereby the cutter is held against the `Wall of a bored hole, and a wash. nozzle depending` from the body, said nozzle directing fluid towardsI the side of the bit and against the cutter.

2. A hole straightening or reaming 'bitv comprising a body, an arm integrally formedwith the body and depending therefrom, said arm be" ing offset from the body and leading the longitudinal center of said body, a cutter journaled on the arm, said bit being mounted on a stiff drill string whereby the bit is held against the wall of a bored hole.

3. A hole straightening or reaming bit comprising a body, an arm integrally formed with the body and depending therefrom, said arm being oifset from the body and leading the longitudinal center of said body, a cutter journaled on the arm, said bit being mounted on a stiff drill string whereby the bit is held against the wall of a bored hole, said body having a iiuid bore extending vertically therethru, a nozzle depending from the body and connected to said bore, said nozzle directing fluid towards the wall of the bore and over the cutter.

4. A hole straightening or reaming bit comprising a body, an arm integrally formed with the body and depending therefrom, said arm being offset from the body and leading the longitudinal center of the body, a cutter journaled on the arm, said bit being mounted on a stiff drill string whereby the bit is held .against the Wall of a bored" hole, said body having a fluid bore extending vertically therethru, a nozzle depend- .ing from the body and connected to said bore,

.ing of a bent pipe, a clamp encircling the pipe,

.a slee've screwed into the body and connecting With-the bore,'and :acoupling connecting the sleeve and the pipe.

'5."A hole straightening or reaming bit comprising a body adapted to be attached to a stili string of pipe, a central fluid bore in. the body, a single' arm integrally formed with the body an-d depending therefrom, said arm being offset from the body and leading the longitudinal center ofthe body, a disc cutter journaled on the arm, a pin extending thru the arm and the cutter, a clamp on the4 pin, abent nozzle, said clamp encircling the nozzle, said nozzle directing fluid over the disc and against the wall of the bore, a sleeve screwed into the botto-m of the body and connecting with said bore, and a coupling connecting the nozzle and the sleeve.

. WALTER HUGHES. 

